Please note, this event has ended.

The Cassini spacecraft has been investigating the whole Saturn system in unprecedented detail since July 2004. One of its primary mission objectives is the study of Saturn's varied moons, which include an array of small to medium-sized icy bodies as well as massive Titan with its own dense atmosphere. Dr. Torrence Johnson will review the latest results from Cassini, including spectacular images of the moons and information about their composition and history.

Dr. Torrence Johnson is a member of the Cassini Imaging Science Team and  a leading expert on the physics and geology of planetary satellites. He is also the Chief Scientist of the NASA Jet Propulsion Laboratory's Solar System Exploration Programs Directorate, where he is helping to map plans for the next era of planetary exploration.

Enjoy these free activities before tonight's lecture:

- 6:00 PM     Visit a Discovery Station

- 7:00 PM      Free Planetarium Show - Infinity Express: A 20-minute Tour of the Universe

- 7:30 PM      Meet the speaker - a special question and answer session with Dr. Johnson about his career

This lecture is free, but tickets are required. To request tickets online, please use the lecture ticket request form linked below. Questions call (202) 633-2398 or e-mail lectures@nasm.si.edu. The series continues through June.

The 2005 Exploring Space Lectures, Rocks in Space: Asteroid, Comets, and Moons, will feature four world-renowned scientists discussing the latest research and images of these ancient "worlds." Lectures will include current and future programs exploring the remnants of the Solar System's earliest days.

This year's lecture series will explore key questions surrounding these ancient rocks in space. What are they made of? What is their history? How have they influenced Earth's past and how might they affect its future?